7-羥基-8-[[4'-[(4-羥基苯基)偶氮][1,1'-聯苯]-4-基]偶氮]萘-1,3-二磺酸 7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-1,3-disulphonic acid

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